Coffee machine



FIG. 1 is a perspective view of a coffee machine showing the ornamental design;

FIG. 2 is a front view of the coffee machine of FIG. 1;

FIG. 3 is a right side view of the coffee machine of FIG. 1;

FIG. 4 is a rear plan view of the coffee machine of FIG. 1;

FIG. 5 is a left side view of the coffee machine of FIG. 1;

FIG. 6 is a top plan view of the coffee machine of FIG. 1; and,

FIG. 7 is a bottom plan view of the coffee machine of FIG. 1. 

The ornamental design for a coffee machine, as shown and described. 